OAKLAND -- SEIU 1021 workers at the Oakland International Airport will launch a strike beginning Monday night over unfair labor practices by the Port of Oakland, which manages the airport.

The strike will start with a rally outside of the airport's Terminal 1 at 9 p.m. Monday and continue at noon Tuesday. Workers will also picket beginning 5 a.m. Tuesday morning at the harbor in Oakland. Union officials said they have no plans to disrupt travel.

Airport and maritime operations account for nearly all port revenue.

SEIU 1021 and the port have been trying for months to negotiate a new contract to cover just over 220 workers. Those workers include, among other staff, electricians, clerical, security and janitors.

The union has not announced when the strike will end.

Port officials have been preparing for a strike, Acting Executive Director Deborah Ale Flint said. But the Port expects no disruptions to service at the airport. Ale Flint said the Port is, however, concerned about economic losses to maritime operations and are trying to "resolve the potential conflict" and prevent picketing at the container facility.